A can do a piece of work in 20 days and B in 15 days. With help of C, they finish the work in 5 days. C can alone do the work in
5 days
6 days
10 days
12 days
A spherical lead ball of radius 6 cm is melted and small lead balls of radius 3 mm are made. The total number of possible small lead balls is:
4250
4000
8005
8000
At what percentage above the cost price must an article be marked so as to gain 33% after allowing a customer a discount of 5%?
40%
45%
35%
47%
The four sides of a quadrilateral are in the ratio of 2 : 3 : 4 : 5 and its perimeter is 280 m. The length of the longest side is:
100 m
150 m
175 m
180 m
Kamal has some apples. He sold 40% more than he ate. If he sold 70 apples, how many did he eat?
18
42
50
90
A train 100 m long is running at a speed of 120 km/hr. The time taken to pass a person standing near the lines is
1 sec
3 sec
5 sec
7 sec
A 8 cm long perpendicular is drawn from the centre of a circle to a 12cm long chord. The diameter of the circle is
10 cm
12 cm
16 cm
20 cm
The point equidistant from the sides of a triangle is called:
Circumcenter
Incentre
Orthocentre
Centroid